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Strombidium sulcatum Claparède and Lachmann, 1858: Ovoid, 60 μm long; anterior bluntly pointed; AZM extends 1/3 the body length; posterior rounded; the region of cortical platelets from the equatorial cleft to posterior end; a band of trichites presents in this region (Carey, 1992).
Strombidium viridae Stein, 1867 (Syn. Strombidium nasutum Smith, 1897): Conical, with a well-developed peristomial collar; rounded posterior; 80 μm long; bundles of trichites make an equatorial band; posterior covered with polygonal cortical platelets; macronucleus vermiform (Carey, 1992).